91002202002 has 64 divisors (see below), whose sum is σ = 214812000000. Its totient is φ = 28457821440.

The previous prime is 91002201959. The next prime is 91002202003. The reversal of 91002202002 is 20020220019.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (91002202003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126124 + ... + 444872.

It is an arithmetic number, because the mean of its divisors is an integer number (3356437500).

Almost surely, 2^91002202002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91002202002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107406000000).

91002202002 is an abundant number, since it is smaller than the sum of its proper divisors (123809797998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91002202002 is a wasteful number, since it uses less digits than its factorization.

91002202002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319088 (or 319082 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The spelling of 91002202002 in words is "ninety-one billion, two million, two hundred two thousand, two".